Diaphragm APL4000 Diaphragm for APL-4000 Please login for pricing SKU: AIR4000DIA Category: Spare Parts Description Brand Description Diaphragm APL4000 Brand Resun Related products Please login for pricingAir Pump, Spare PartsLP Air Pump Valve VAL-20 / VAL-40 / VAL-60 / VAL-100 Please login for pricingInternal Filters, Spare PartsJet Plus Impellar IMSH-200 / IMSH-380 / IMSH-700 | IMSH-1000 Please login for pricingSpare Parts, Wave MakersImpeller HWM4000IS Please login for pricingExternal Filters, Spare PartsCleanTech Shaft / Impellar IMX Please login for pricingSpare PartsDiaphragm DIA-9906 Please login for pricingSpare PartsCartridge CRP070RP